# std::mdspan<T,Extents,LayoutPolicy,AccessorPolicy>::size

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< cpp‎ | container‎ | mdspan

constexpr size_type size() const noexcept; |  | (since C++23)

Returns the number of elements in `mdspan`.

Equivalent to `extents`().`fwd-prod-of-extents`(`rank`()).

The size of the multidimensional index space `extents()` must be representable as a value of type `size_type`. Otherwise, the behavior is undefined.

### Return value

The number of elements.

### Example

| This section is incomplete Reason: no example

### See also

| This section is incomplete

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